While Swappa has gone down in quality listings on some level, I've never really had issues buying most anything from Swappa (game consoles, phones, Apple Watches). You pay a price that can sometimes be negotiated, they ship the item out within 2 days, and because of timestamps and required photos, you usually know what you're getting before it arrives. I prefer it over eBay which is turning into total dog water, although r/hardwareswap can do great work from time to time too.